The 100th day of school is a dress-up day kids remember, and the costume has to last through reading groups, recess and a lunch line. Below are forty ideas: centenarian grandmas and grandpas, shirts covered in exactly 100 of something, number-themed characters and a handful of DIY looks. Almost all of them start from clothes already in a drawer, plus felt, stickers or a few craft-store pieces. I've kept every one school-friendly, with simple hair, optional makeup, light props and shoes a child can actually run in. Adjust the colors, layers and decorations for your child's age, the school's rules, any sensory needs and the fact that this day usually lands in the coldest stretch of winter.
Attaching 100 Pieces So They Last Until Home Time
Most of these costumes come down to one job: fixing a hundred small things to a shirt so they are still there at three o'clock. The method matters more than the decoration, and it is the part I see go wrong most often.
- Lay everything out first. I place all 100 pieces in ten rows of ten on the shirt, take a phone photo, then glue one row at a time. The photo saves you from recounting when you lose track.
- Put a piece of cardboard inside the shirt before gluing. Fabric glue and paint soak through and will stick the front to the back.
- Use fabric glue for felt, buttons and pom-poms and give it a full night to cure. Hot glue is fast but brittle on knit fabric; it pops off as soon as the shirt stretches over a child's shoulders.
- Sew anything heavy. Buttons, beads and big felt shapes stay put far better with a few stitches than with glue, and a sewn shirt survives the washing machine.
- Check the fabric tag. Iron-on letters and some adhesives grip cotton blends well but peel off slick polyester, so test one piece somewhere hidden first.
Give yourself two evenings if you can: one to attach, one to let it dry and fix whatever lifted. In the morning, run your hand over the shirt and press down anything loose before it leaves the house.
1. Classic Grandma 100th Day Costume
A floral dress and a soft cardigan are all you need for a 100-year-old grandma. I go knee-length so the dress never tangles on stairs, then add neutral tights and loafers. Put the hair in a low bun and brush washable silver hair wax over a few strands; on darker hair, layer it twice and let it dry between coats or it looks patchy. Costume glasses, a short pearl strand and a small handbag finish her. A touch of rosy cheek is plenty. If she carries a cardboard cane, it's a photo prop only, never something to lean on in the hallway.
2. Classic Grandpa 100th Day Costume
Start this grandpa with a plaid button-down, a soft cardigan and khakis pulled up a little higher than usual. Clip-on suspenders do two jobs: they read as old-fashioned from across the room and they keep the trousers up during a busy day. Add a bow tie, costume glasses and brown slip-ons or sneakers. A neat side part with washable gray wax looks right, and I dab a little silver on the eyebrows with a makeup sponge rather than a brush, which streaks. A folded newspaper or a cardboard pocket watch is enough of a prop. Skip oversized pants; borrowed adult trousers are the most common tripping problem I see on dress-up days.
3. Colorful Grandma 100th Day Costume
Not every child wants to look gray, and this version gives them the grandma idea in bright color. A patterned midi skirt, a plain blouse, a cropped cardigan, colored tights and supportive Mary Janes do the work. A playful scarf, chunky beads and clear-lens cat-eye glasses add the character. I tie a small floral scarf over a loose bun, which says "grandma" without any wig at all. Soft pink blush and clear lip balm are enough on the face. A knitting basket of yarn makes an easy prop, but leave real needles at home or swap in cardboard ones.
4. Dapper Grandpa 100th Day Costume
For the child who likes to dress sharp, build a little suit: white collared shirt, sweater vest, dark trousers and a child-size blazer. Add a bow tie, a flat cap, costume glasses and brown sneakers that pass for dress shoes. Comb the hair back and touch washable white wax at the temples only; the temples are where gray shows first, so it reads true even with a light hand. Smile lines in taupe face pencil are optional, and I'd skip them for a child who rubs their face. A cardboard pocket watch and a handkerchief in the blazer pocket finish it. Because every piece is ordinary occasion wear, it can go straight back into the closet afterward.
5. Retired Teacher 100th Day Costume
A retired teacher is a sweet twist on the centenarian theme, and teachers love seeing it. Dress the child in a long cardigan, a collared blouse or shirt, relaxed trousers and sensible loafers. Reading glasses on a neck cord, a fabric lanyard and a name tag reading "Teaching for 100 Years" carry the joke. Style the hair in a bun or tidy side part with a little silver. Rosy cheeks and slightly darker eyebrows are plenty. I'd send the notebook, the oversized cardboard pencil and the paper books in a tote, because a child carrying an armful of props all morning will set them down somewhere and forget them.
6. Gardening Grandma 100th Day Costume
Garden colors keep this grandma sweet instead of theatrical. Layer floral overalls or a flower-print dress over a long-sleeve shirt, then add a knitted cardigan, a gardening apron, patterned socks and clean rain boots or green sneakers. A floppy sun hat over a low bun, with silk flowers tucked into the band, does most of the talking. Rosy cheeks and lip balm are all the makeup it needs. Fill a light watering can with tissue-paper flowers, never water, and tuck clean fabric gloves in the apron pocket. It's my pick when a school asks for positive aging costumes, since it shows an active hobby rather than frailty.
7. Golfing Grandpa 100th Day Costume
Plaid and a flat cap make a sporty grandpa who still moves like a kid. A polo under a sweater vest, plaid trousers or knee-length shorts, tall argyle socks and sneakers set the look. Slick the hair into a side part with washable gel and add a touch of silver at the temples. Brushed gray eyebrows are optional. For the club, I cut a cardboard tube and wrap a foam head on the end; a plain plastic golf ball in the pocket works too. Nothing here is heavy, so recess goes on as normal.
8. Knitting Grandma 100th Day Costume
This is the one I reach for when the forecast is freezing, because every piece is warm. A soft sweater, a calf-length skirt, thick tights and flat ankle boots form the base. Layer a patterned shawl on top and add round glasses, clip-on pearl earrings and a tape-measure "necklace" made from ribbon. A bun with a few washable gray streaks looks convincing. Fill a little basket with yarn balls and use rolled cardboard tubes as needles. Knot or tape the yarn ends first; a loose ball will unwind across the classroom floor the first time it drops.
9. Baking Grandma 100th Day Costume
A baking grandma brings a cozy kitchen feeling to the day. Start with a simple dress, or a blouse and skirt, and tie a patterned apron over it. Add a cardigan, neutral tights and cushioned slip-on shoes. A bun with a small scarf tied around it, temporary silver wax if wanted, round glasses, rosy cheeks and a pearl necklace give her a face. For the prop, a light mixing bowl of felt cookies or a cardboard recipe card labeled "100 Cookies" does the job. Real food stays home unless the teacher approves it, because allergy rules in most classrooms are strict.
10. Artist Grandma 100th Day Costume
Creative kids can turn 100 into an old artist. Tie a paint-splattered craft apron over a striped shirt and wide-leg pants, then add a bright cardigan, a beret, round glasses and slip-resistant sneakers. Tuck the hair into a loose bun under the beret with a few gray streaks framing the face. A cardboard palette with paper paint circles and a foam brush makes the prop. I like painting 100 tiny dots on the apron, which ties the art theme back to the number and gives the child something to count for the class.
11. 100 Pom-Pom Shirt Costume
Kids love helping glue on pom-poms, so this is a good one to make together. Use a plain sweatshirt or a sturdy tee and lay the pom-poms out in ten rows of ten before anything gets glued. Fabric glue holds better than hot glue here, and I give it a full night to cure; hot glue pops off soft knit the moment the shirt stretches. Keep them away from the neckline and underarms, where they rub. Solid joggers, bright socks, sneakers, ponytails or braids, a few washable face-paint dots and a "100 Days" badge finish it. Count again in the morning and press down any pom-pom that has lifted.
12. 100 Button Shirt Costume
Buttons in groups of ten make counting by tens obvious the moment a teacher looks. Sew or glue light craft buttons onto a plain tee, mixing colors and sizes. I'd avoid metal buttons; once you have a hundred of them, the shirt sags and pulls at the neck. Layer it over a long-sleeve tee with jeans or soft trousers and lace-up sneakers. Button-shaped clips or a plain headband keep the hair neat, and a few cheek dots can echo the shirt. A cardboard spool of thread or a fabric measuring tape is a light prop. Sewn buttons survive the wash, so the shirt can come back next year.
13. 100 Googly Eyes Monster Costume
Exactly 100 googly eyes on a friendly monster is the kind of joke a whole class laughs at. Draw or attach a big smiling monster face to a bright sweatshirt, then scatter the eyes around it. For younger children I use the flat, fully glued craft eyes, because the loose-pupil kind can pop off and they're small enough to swallow. Leggings or joggers, striped socks and colorful sneakers keep it easy. Spiky hair with temporary colored wax, a small painted eye on each cheek, felt horns on a headband and foam claws on gloves add the character. Expect a few eyes to go missing anyway, so glue on two or three spares.
14. 100 Gold Stars Shirt Costume
Gold stars are the quiet choice for a child who doesn't want a wig or a character. Lay ten rows of ten fabric or foam stars across a navy sweatshirt, leaving the sleeves and underarms clear so the arms move freely. Write "100 Star Days" in the center with fabric paint or iron-on letters. Iron-on letters grip cotton blends well but can peel on 100% polyester, so check the fabric tag first. Black or navy joggers, metallic socks and white sneakers with removable star clips go with it. A star headband, a tiny gold star on each cheek and a cardboard award ribbon marked "100" finish the outfit.
15. 100 Hearts Shirt Costume
One hundred hearts is a sweet way to show a child likes school. Cut small felt hearts or use durable fabric stickers and attach them across a red, pink or white sweatshirt. I sort them into ten color sets of ten, which makes the count easy to check at a glance. Pair the top with jeans, a tulle skirt over leggings or joggers, plus heart socks and sneakers or Mary Janes. Heart clips or braids, a heart stamp on each cheek and a light sign reading "100 Days to Love" round it out. Keep the front panel flat at desk height so writing and sitting stay comfortable.
16. 100 Smiley Faces Shirt Costume
Smiley faces are cheerful, gender-neutral and fast enough to make the night before. Use round yellow felt, foam stickers or fabric markers to make ten groups of ten faces, changing the expressions a little so the shirt is fun to study up close. Black leggings or joggers, bright socks and yellow or white sneakers suit it. Add a smiley headband or a yellow cap, whichever the child prefers, and simple yellow cheek circles if they want face paint. A small cardboard sign reading "100 Days of Smiles" is the only prop. Keep thick pieces off the back; kids lean against chair backs all day and the bumps get uncomfortable.
17. 100 Dinosaur Shirt Costume
Dinosaur fans will happily count 100 tiny dinosaurs. Attach felt dinosaur silhouettes or footprints to a green sweatshirt in clear groups of ten, and add "Stomping Through 100 Days" in fabric letters. Brown or green joggers, striped socks and sturdy sneakers are the base. A soft felt tail can attach to the waistband, but I keep it shorter than the back of the knee so it never gets stepped on. Washable green wax for spiky hair, a few painted scales on the cheeks and a light cardboard dinosaur egg finish it.
18. 100 Crayons Shirt Costume
A crayon shirt suits the child who would draw all day if allowed. Cut 100 small crayon shapes from felt or cardstock and arrange them in a rainbow on a plain black or white sweatshirt. Pair it with bright pants or leggings, striped socks and sneakers in their favorite color. A pointed crayon hat from light cardstock sits well on comfortable elastic, and the hair can stay natural underneath. Rainbow lines on the cheeks and an oversized cardboard crayon with rounded ends make it playful, and the shirt can read "100 Days Brighter." Plain paper curls and tears by lunchtime, so I laminate paper shapes or switch to felt.
19. 100 Balloons Shirt Costume
Felt balloons give you all the party feeling with none of the popping. Cut 100 small balloon shapes, attach them to a sky-blue sweatshirt and draw thin strings with a fabric marker. Put a big "100" near the center so the milestone reads right away. Jeans or soft joggers, rainbow socks and white sneakers keep it simple. Curled ribbons on a secure headband look festive; I trim them short so they don't flick into the child's eyes. Tiny painted balloons on the cheeks and a light cardboard gift box for photos finish it. Real balloons distract a whole room and leave latex scraps behind, which is a problem for anyone with a latex allergy.
20. 100 Busy Bees Costume
Black and yellow plus 100 felt bees makes a clever counting costume. Attach the bees in organized groups across a yellow sweatshirt and add "Busy for 100 Days." Black leggings or joggers, striped socks and yellow sneakers go underneath. Soft fabric wings should sit close to the back; I tack them to the shirt at two points so they don't flop sideways. A flexible antenna headband works over braids, ponytails or a side part. Yellow cheek dots, a painted bee trail and a paper flower prop are optional extras. Keep the wings small enough to fit against a chair back and under a backpack strap.
21. 100 Gumballs Costume
A white sweatshirt becomes a gumball machine with 100 small felt circles. Arrange them inside a dome outlined in gray fabric paint, then add a red felt base near the hem. Red joggers or a red skirt over leggings, white socks and sneakers match the machine. A headband with a few soft pom-poms or simple braids with bright ties suit the hair, and round cheek dots echo the gumballs. An oversized cardboard coin marked "100" is the prop. Leave real candy and small loose balls at home. Flat felt gives the same bright effect and nothing rolls under the desks.
22. 100 Sprinkles Cupcake Costume
Sprinkles are a fun excuse to dress as a cupcake. Count 100 short felt sprinkles into color groups before gluing them to a pastel sweatshirt. A soft pleated felt panel around the bottom of the shirt makes the wrapper. I keep that panel short and flexible, because a stiff wrapper rides up the moment a child sits down. Coordinating leggings, bright socks and supportive sneakers go with it. Top a high bun with a red pom-pom "cherry" or use a headband, and paint a few sprinkle lines on the cheeks. The cardboard cake stand is for photos at home, not for carrying around school.
23. 100 Fingerprints Art Costume
One hundred fingerprints turn a white tee into the child's own artwork. Stamp them with washable fabric paint, let them dry, then an adult can add tiny faces, legs or patterns. I always do this at least two days ahead, because fabric paint needs time to dry and then heat-setting with an iron, or the prints smear onto the desk and rub off in the wash. Layer the shirt over a long-sleeve top with solid pants, bright socks and easy-clean sneakers. Rainbow clips or a paint-splatter headband, fingerprint shapes on the cheeks, a cardboard palette with a foam brush and "100 Prints Smarter" beneath the design finish it.
24. 100 Cotton Ball Cloud Costume
Cotton balls look dreamy as clouds, but they are the least durable thing on this list. Real cotton sheds and gets flattened once a child leans on a desk, so for a full school day I swap in small craft pom-poms, which hold their shape. Group the 100 pieces into several fluffy clouds on a sky-blue sweatshirt and add a felt rainbow or a yellow sun near the shoulder. Blue leggings or joggers, white socks and pale sneakers go with it. White ribbon bows or a silver headband, pale blue swirls on the cheeks and a light cardboard sun marked "100 Days" finish the idea. Keep the clouds off the cuffs and the back.
25. 100 Colorful Feathers Costume
Craft feathers can show 100 without the costume turning into a bulky bird suit. Attach them in layered rows across the front and shoulders of a plain sweatshirt, in rainbow colors or a planned palette. Leave the sleeves and back mostly bare so writing and sitting stay easy. Solid leggings or joggers, striped socks and light sneakers keep the rest simple. A small feather headband or a neat ponytail, a few gentle face-paint strokes, felt wings and a cardboard feather labeled "100" round it out. Feathers drop more than any other trim, so I check the whole shirt the morning of and glue down anything loose.
26. 100 Beads Necklace Costume
Instead of decorating a shirt, show 100 as ten necklaces of ten big beads each. Chunky foam or wooden craft beads are easy to count with small fingers. I keep every strand above the waist and string them on stretchy cord that gives if it catches, rather than strong cord that won't. Layer them over a solid sweatshirt with jeans, joggers or leggings, colorful socks and sneakers. Bead clips or braids, a few face-paint dots in the bead colors and a cardboard "100" badge finish it. Some teachers prefer the strands attached to the shirt with removable loops so they can't swing. Kids who like hands-on counting enjoy sliding the beads along all day.
27. 100 Tally Marks Shirt Costume
Tally marks are the fastest idea here, quick enough to make at the breakfast table. Draw 20 groups of five tallies across a plain sweatshirt with fabric markers, switching color each row so the groups are quick to count. Add "100 Days Counted" near the center. Dark jeans or joggers, number socks and everyday sneakers go with it, plus a headband or cap with a bold paper "100." Five tiny tallies on one cheek is all the face paint it needs. Because it's completely flat, it fits under a winter coat with no squashing.
28. 100 Handprints Shirt Costume
Small paper or felt handprints celebrate everyone who helped fill those 100 days. Trace a small hand template, cut 100 pieces and attach them to a sweatshirt in ten groups, with a big 100 in the middle. Solid pants, bright socks and comfortable sneakers go underneath. Hand-shaped clips or ribbon bows, a tiny stamped handprint on each cheek with skin-safe paint and a cardboard sign reading "Give Me 100" add the fun. Smooth and secure every paper edge, since sharp cardstock corners scratch the inside of the arm. It means the most when classmates or siblings add their own colors, names or kind words to the hands.
29. 100 Days Brighter Sunglasses Costume
"100 Days Brighter" reads clearly from across a room when it's a big felt sun on a yellow sweatshirt. Surround it with 100 short rays, dots or metallic stars. White or blue pants, yellow socks and clean sneakers keep it bright. Oversized costume sunglasses add the joke; pick clear or lightly tinted lenses, since dark ones in a classroom make reading hard, and they should come off for lessons. A sun headband or yellow ribbons, gold rays painted around the cheeks and a cardboard sun marked 100 finish it. I'd skip glitter entirely; it ends up on every desk and the class carpet for weeks.
30. 100 Days Flew By Aviator Costume
An aviator is a clever way to say the year is flying by. Begin with a white shirt, a brown bomber-style jacket, khaki pants and brown boots or sneakers. Add a fabric scarf, a soft aviator cap and costume goggles pushed up on the forehead, never worn over the eyes. Tuck the hair under the cap and add rosy cheeks for a windswept look. Attach 100 small paper airplanes in groups to the jacket or shirt, keeping the sleeves clear. I put the planes on the shirt rather than the jacket when I can, because classrooms are warm and the jacket will come off by mid-morning. A foam or cardboard airplane and a "100 Days Flew By" badge finish it.
31. 100 Days Smarter Scientist Costume
A scientist costume celebrates curiosity more than age. A child-size white lab coat over a bright shirt and black pants is the base, and 100 small felt molecules, numbers or dots go on the coat. Clear safety-style glasses, a name badge and practical sneakers finish the clothes. Gently teased hair with washable white wax at the tips gives the mad-scientist look, and silver face-paint dots add a little fun. Fill a clean plastic beaker with colorful tissue paper, never liquid, and carry a cardboard clipboard marked "Experiment 100." Powders and breakable props stay home; one spill in a classroom ends the fun quickly.
32. 100th Day Superhero Costume
An original superhero lets the child invent the character. A solid long-sleeve shirt with a big felt "100" emblem, joggers or leggings, a short fabric cape, a soft belt and high-tops build the suit. Decorate the cape with 100 small stars or lightning bolts and keep it above the knee; longer capes get trodden on in hallways and caught in chairs. A neat ponytail, braids or a slick side part all work. I'd paint a simple eye-mask on the face instead of using a hard mask, which narrows a child's view. Soft wrist cuffs and a cardboard shield reading "100 Days Strong" finish the hero.
33. 100 Shapes Robot Costume
Skip the cardboard box. A robot made from 100 flat felt shapes looks just as mechanical and lets a child sit at a desk. Attach circles, squares, triangles and rectangles to a silver or gray sweatshirt and joggers, arranged like buttons, gears and control panels, with a big "100" on the chest. Silver sneakers or removable gray fabric shoe cuffs, washable silver hair wax or a foam headband with soft antennae, and a light touch of silver face paint add the details. A cardboard control panel is the only prop. Full box bodies look great in photos but can't fit through a classroom door sideways or sit on a chair, which is why I don't suggest them for school.
34. Student 100 Years in the Future Costume
A student from the future is a fun reversal of the aging theme. Layer a metallic vest over a plain sweatshirt and add joggers with 100 small holographic-style paper circles down the sides. White sneakers, silver fabric wrist cuffs and clear futuristic glasses give it the space-age look. Hair can go into a high ponytail, a sleek side part or temporary blue-tipped spikes. Silver face-paint lines and tiny blue dots keep the makeup friendly. A cardboard tablet labeled "School Day 100" and a laminated future-student ID are the props. I'd leave out anything with flashing lights; teachers usually ask for those to be switched off within the first hour.
35. School Student From 100 Years Ago Costume
Dressing as a student from 100 years ago is a historical alternative to the centenarian. A collared shirt with suspenders and cropped trousers, or a modest dress with a pinafore and cardigan, sets the period. Knee socks, lace-up boots or dark sneakers and a flat cap or ribbon headband finish the clothes. Braids, a bun or a neat side part suit it, with natural makeup and rosy cheeks if wanted. A small chalkboard cut from black cardstock with "100 Days" in white marker and a few tied paper notebooks are the props. Keep the clothing generally vintage rather than copying any particular culture's dress.
36. 100 Books Bookworm Costume
Book lovers can be a bookworm with 100 tiny felt book covers in rows on a green sweatshirt, each one marked with a letter or number. Green joggers or leggings, striped socks and comfortable sneakers go with it. A soft segmented tail attached above the knee is the fun part; I stuff it lightly with batting so it stays soft and keep it short for safe walking. A headband with bendable antennae or green ribbon clips, small green cheek dots with a smile line, and one favorite book or a cardboard "My 100th Read" finish it. Don't send a tall stack of real books. They are heavy and somebody will lose one.
37. 100 Math Facts Costume
This one turns the shirt into a math board. Write age-appropriate equations on 100 small white felt rectangles and attach them in rows to a black sweatshirt. Answers can vary, with ten highlighted cards that each equal ten. Black joggers, number-print socks and bright sneakers suit it, plus a foam calculator headband or a cardboard 100 badge. Tiny plus, minus and equals signs on the cheeks and a light clipboard with one favorite equation finish it. Fabric marker on felt can bleed, so I test one rectangle first and use a fine-tip marker for the equations.
38. 100-Piece Puzzle Costume
Puzzle pieces show how each school day fits into one bigger picture. Cut 100 small pieces from colorful felt, check that every edge is smooth, then attach them to a dark sweatshirt. Group some into a large 100 and scatter the rest around it. Matching pants or leggings, bright socks and everyday sneakers keep it simple. Puzzle clips or a bright headband, one painted puzzle piece on each cheek and an oversized cardboard piece reading "We Fit Together" round out the theme. It's the one I suggest when a class is celebrating teamwork, because the message is built into the shape.
39. 100 Spots Puppy Costume
A white shirt and pants with exactly 100 black felt spots makes a puppy that doubles as a counting costume. Spread the spots across the front, back and sleeves and count them the night before. Floppy felt ears on a headband, a short soft tail and black or white sneakers do the rest. Let the hair sit naturally under the ears or pull long hair into low ponytails. A black painted nose, a few whisker dots and one eye patch in washable face paint finish the face, along with a cardboard dog tag marked "100." Keep spots off the shoe soles, where they peel and get slippery, and keep the tail short.
40. 100 Flowers Garden Costume
End with a wearable garden of 100 felt flowers on a green sweatshirt, grouped by color or in sets of ten. Green leggings or joggers, floral socks and comfortable sneakers go with it. A headband with a few larger fabric flowers works over braids, curls or a ponytail. Soft pink and yellow flowers on the cheeks and a light cardboard watering can or butterfly are optional. Make sure the flowers lie flat around the arms and back so sitting is easy. Since the 100th day usually falls in deep winter, I like that this one brings a bit of spring indoors.
Gray Hair and Wrinkles Without the Itch
The centenarian looks are the classic choice, and the hair and face are where they succeed or fail. A costume wig is the first thing a young child pulls off; they are hot and scratchy under classroom lights. I'd use washable hair color in spray, wax or chalk form instead, and put it on outside or over an old towel because spray drifts.
- Patch-test face paint and hair color on the inside of the wrist the day before. Children's skin reacts more readily than adults'.
- Keep aging makeup light: a few soft lines at the eyes and mouth in taupe pencil, then blend. Heavy wrinkles smear by snack time.
- Spray hair color can rub off onto collars and car seats. A dark collar hides it; a white one won't.
- Wash it out the same evening with shampoo, since some colors dry the hair if left in overnight.
It's also worth checking how the school feels about aging costumes. Some schools now steer families away from canes, walkers and hunched-over acting, and ask for cheerful takes instead. The gardening, golfing, baking and artist versions above suit those rules, because they show a person enjoying a hobby at 100 rather than a joke about being frail.
A Five-Minute Test Run the Night Before
Put the whole outfit on your child after dinner and have them do the things school actually involves. Sit on a chair and lean back. Put on the backpack and the winter coat. Cross-legged on the floor for story time. Raise a hand. Go to the bathroom on their own. Anything that pokes, rubs, falls off or needs an adult's help gets fixed tonight, because a teacher with twenty-five children can't refasten a wing or retie a wrapper. If your child has sensory sensitivities, take out scratchy labels and let them wear the costume over their usual soft layers.
A Plain Sweatshirt Does Most of the Work
The 100th day outfits that work best combine a clear number theme with clothes a child can wear for six hours. The grandma and grandpa looks bring the most personality, while the decorated shirts turn counting into part of the fun. Superheroes, animals, robots and school themes are there for kids who don't want to look old. Whichever you make, secure every decoration, keep the props light and have your child walk, sit and pull on their coat in it the night before. Clothes you already own and a bag of felt will get you a costume your child is proud of without much spending.
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